Process of making carbon paper



Jan. 18, 1927.

' 1,614,490 G. W. POORMAN PROCESS OF MAKING CARBON PAPER Filed Jan. 12, 1925 INVENTOR. eor e h[ 7 00/7773 51,5 ATTORNEYS.

Patented Jan. 18, 1927. 1,614,490

UNITED STATES PATENT OFFICE.

GEORGE W. POORMAN, OF ROCHESTER, NEW YORK, ASSIGNOR TO KEE LOX MFG. CO., OF ROCHESTER, NEW YORK, .A. CORPORATION OF NEW YORK.

PROCESS OF MAKING CARBON PAPER.

Application filed January 12, 1925. Serial No. 1,807.

The present invention relates to carbon coating 2 or at least before the cooling or paper, and an object thereof is to provide a contraction of the color coating, a coating carbon paper which is non-curling. A fur- 3 in a hot condition is applied to the oppo- -ther object of the invention is to provide an site face of the sheet. This last mentioned 5 improved process of making carbon paper, coating may be formed from caseine, wax,

whereby the same becomes non-curling 1n a glue substance or similar material and use. which contracts when cooled an amount sub To these and other ends, the invention stantially equal to that of the color coating consists of certain parts and combinations upon cooling, so that both sides of the sheets of parts, all of which will be hereinafter dewill be sub ected substantially to the same scribedrthe novel features being pointed out contracting stresses, both coatings being in the appended claims. cooled immediately and simultaneously In the drawing: It is apparent that there is produced by .The figure is an enlarged sectional view this process a non-curling paper with a color of a carbon sheet constructed in accordance coating on one side not penetrating the with this invention. sheet, and a coating on the opposite side The best modern carbon paper is made by not penetrating the sheet, the two coatings applyingthe color coating to a carrier sheet having substantially the same contracting comprising the best English and German properties when cooled and dried. tissue papers. These tissue pa ers are very What I claim as my invention and desire thin and are substantially free rom holes, so to secure by Letters Patent is: that they are but very slightly saturable. The process of making carbon sheets When the color coating is applied to the carwhich consists in applying to a tissue of very rier sheet, it does not penetrate the paper slightly saturable properties two coatings in to any great extent due to the fact that the a hot condition to the opposite faces of the latter is so closel formed. As the color tissue, one of said coatings containing a colsolution is applie to the carrier sheet in a oring material, the other being free from hot condition, the color coating contracts coloring material both of said coatings havwhen cooled with the result that the finished ing the tendency to penetrate the tissue carcarbon sheet has a curled condition, the rier, and immediately and simultaneously color coating placing one surface of the car cooling both coatings to set the same before rier sheet under greater contracting stress either coating has saturated through the tisthan the other surface. sue carrier so as to produce a non-curling According to the present invention, durcarbon sheet. ing the coating of the sheet 1 with the color GEORGE W. POORMAN. 

